East Asian fourfinger threadfin (Eleutheronema rhadinum)

Scientific name: Eleutheronema rhadinum Jordan & Evermann, 1902

The East Asian fourfinger threadfin (Eleutheronema rhadinum) is a brackish-water fish of the family Polynemidae. Native range: Northwest Pacific, China, Japan and Viet Nam. Not reported from the vicinity of oceanic islands.

Biology

Dorsal spines (total): 9; Dorsal soft rays (total): 13-15; Anal spines: 3; Anal soft rays: 14 - 16. Pectoral filaments 4; fin membranes black. Vomer with deciduous tooth plates on both sides. Posterior part of maxilla deep, 3% of SL. Short tooth plate extension onto lateral surface of lower jaw, 8-9% SL.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name: Eleutheronema rhadinum
Family: Polynemidae (Threadfins)
Order: Perciformes (Perch-like fish)
Class: Actinopterygii (Ray-finned fishes)
Maximum length: 73.9
Depth range: 5–8 m (16–26 ft)
Environment: Marine; brackish; pelagic-neritic; depth range 5 - 8 m
Climate: Temperate
Distribution: Northwest Pacific: China, Japan and Viet Nam. Not reported from the vicinity of oceanic islands.
Conservation status (IUCN): Not Evaluated
Threat to humans: Harmless
Resilience: Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)

Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.

Last updated 27 September 2026